Drafting instrument



Nov. 6, 1934.

v. A. l.. AsENclo 1,979,724

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ATTORNEYS. rj f Nov. s, 1934.

v. A. L. AsENclo DRAFTING INSTRUMENT 'Filed Feb. 2o. 1931 2 Sheets-Sheet 2 INVENToR: Vfl. L. Hsencz'o BY" m A TT ORNE YS.

Patented Nov. 6, 1934 PATENT OFFICE DRAFTING INSTRUMENT Vicente Anselmo Llacer Asencio, Valencia, Spain Application 2 Claims.

The invention relates to apparatus for tracing interrupted lines of variable length and width either straight or curved.

f The main object of the apparatus is to simpli- I fy the Work of engineers, architects and draughtsmen by an apparatus which shall facilitate the drawing of interrupted lines. This object has been attained by a careful study and p calculation of the thicknesses of perforated 19 sheets and the relative widths of the ribs of perforations and a simple apparatus hereinafter described has been devised which will speed up, improve, and simplify the drawing of straight or curved interrupted lines so that only the same time is taken to draw an interrupted line as is now taken to draw a similar continuous line.

Various constructionail forms of apparatus employing this basic principle are envisaged and will be described with reference to the accompanying drawings in which:-

Fig. 1 is a top plan View of one form of the invention,

Fig. 2 is an enlarged transverse sectional view on line 2 2 of Fig. 1,

Fig. 3 is a bottom plan of the arrangement shown in Fig. 1,

Fig. 4 is a cross section taken on line 4--4 of Fig. 3,

Fig. 5 is a sectional detail of the combined bolt, pinion and nut shown per se,

Fig. 6 is an elevational detail of the operating knob,

Fig. 7 is a longitudinal sectional view taken on line 7-7 of Fig. 3,

Fig. 8 is a plan view of a piece of blotting paper shown in position in Figure 2 only,

Fig. 9 is an enlarged fragmentary sectional detail taken on line 9--9 of Fig. 7,

Fig. 10 is a top plan View of a slightly modied form of ruler, and

Fig. 11 is a fragmentary plan detail of a further modified form of rulerl Similar characters of reference are employed in all of the above described views to indicate corresponding parts.

Referring now, more particularly, to the drawings there is provided a plate which along its whole length and on both sides has guide means for facilitating the making of interrupted lines in the form of a series of perforations y running transversely to its length, the one series of perforations being larger than the other, the yedges of the plate being suitably creased over to form a smooth side edge for drawing contin- February 20, 1931, Serial No; 517,359

In Spain July`16, 1930 f K (o1. es iw inafter described. A button-or knob b is pro- 60 vided in conjunction with the'nut t for con- -venience of" operation. The plate 1 carries a toothed rack a which is engaged by a pinion e secured to the nut t by screwing thereinto and locked by a grub-screw i. It will be apparent by this construction the ruler r may be made to move transversely to the plate 1, and in order to cause the ruler r to move with its longitudinal axis parallel to the longitudinal axis of the plate 1 there are provided in the plate 1 two transverse slots h h'. Moving in the slots as shown in Figure 9 are two screws s secured into the ruler r. These screws serve to hold the ruler r in close proximity to the plate 1.

ln order to produce an adequate grip between the ruler 1 and the plate 1 a sheet of blotting paper 10 may be interposed between the two and preferably secured to ruler r by an adhesive or the like, this also has the effect of keeping the perforations y clean when ink is used for drawing interrupted lines. Figure 8 shows a plan View of the absorbent material and Figure 2 only shows this material in position.

The plate 1 is provided also with two substantially circular openings which are slotted slightly in the transverse direction as shown in Figure 3, from these openings project springs f f secured to the ruler serving to lift the ruler from the paper or the like so that soiling of the drawing when inkL is being used is prevented. When a pencil is used the springs may be turned, passed through the transverse openings extending from the circular openings in the plate l and concealed between the ruler r and the plate.

From the foregoing it will be apparent that continuous lines or interrupted lines may be drawn and in the event or" ink being used means are provided whereby a diierent portion of the perforations may be used for each successive line and the perforations are kept clean automatically by the interleaved blotting paper.

Figure l0 shows a ruler constructed in accordance with the foregoing but having in the plate 1 and on each side of the ruler r three sets of perforations y each set having certain characteristics, that is' to say, one set of perforations gives an interrupted line consisting of three short strokes separated by dots and then a long stroke separated from the three short strokes on either side of it; a further set of perforations gives a diierent sequence of long strokes, short strokes and dots.

In the arrangement shown in Fig. 11 a plain ruler r" is constructed with an indented edge y" so that upon drawing a pencil or other instrument along the edge an uninterrupted line will be produced.

The above described instrument may be constructed of any suitable material, the thickness of the plates provided With the perforations being preferably between 1/20th m/rn and 3/l0ths m/m according to the use for Which they are designed and the section of the ribs between these perforations, may be circular or semi-circular, prismatc or any other suitable shape.

It will be clear that the size and shape of the Y 1. A drafting instrument comprising a plate provided with guide means for facilitating the making of interrupted lines, a ruler slidably mounted on said plate, a rack secured to the plate, a pinion rotatably mounted in the ruler and cooperating with the rack, an operating knob secured to the pinion so that rotation of the pinion causes transverse movement of the ruler across the plate, guide openings in the plate, screws secured to the ruler and coacting with said guide openings to ensure parallel movement of the ruler with respect to the plate.

2. A drafting instrument comprising a plate provided with guide means for facilitating the making of interrupted lines, a ruler slidably mounted on said plate, a rack secured to the plate, a pinion rotatably mounted in the ruler and cooperating with the rack, an operating knob secured to the pinion so that rotation of the pinion causes transverse movement of the ruler across the plate, guide openings in the plate, screws secured to the ruler and coacting with said guide openings to ensure parallel movement of the ruler with respect to the plate, further apertures in the plate and springs secured tothe ruler and projecting through the apertures so as to raise the instrument from the surfacev on which it rests.

VICENTE ANSELMO LLACER ASENCIO. 

